Artifact: Perceive/Plan/Act/Observe Loop Trace

A recorded session transcript with each Perceive/Plan/Act/Observe step labeled across two iterations -- exercises co-02.

Task given to the agent: "The test suite is red -- fix it."
 
=== ITERATION 1 ===
[PERCEIVE] Reads the failing pytest summary: 1 failed, 4 passed --
           test_calculate_total_applies_discount fails: expected 90.0, got 100.0.
[PLAN]     Reasons the failure lives in calculate_total()'s discount handling;
           decides to open the source file before touching anything.
[ACT]      read_file(path="src/orders/calculate_total.py")
[OBSERVE]  Sees the function itself is correct -- subtotal - subtotal * discount --
           but the caller passes discount=0 on every call, never threading the
           real value through. The bug is one line away, in the caller.
 
=== ITERATION 2 ===
[PERCEIVE] Carries forward Iteration 1's finding: the caller drops discount.
[PLAN]     Decides the fix is a one-line edit to the caller, then a rerun of
           the suite to confirm, rather than touching calculate_total() at all.
[ACT]      edit_file(path="src/orders/checkout.py",
                      diff="-  calculate_total(subtotal, 0)\n+  calculate_total(subtotal, discount)")
[OBSERVE]  run_shell(command="pytest -q") -> "5 passed" -- the fix closed the
           gap Iteration 1's Observe step identified.

Verify: all four phase labels ([PERCEIVE], [PLAN], [ACT], [OBSERVE]) appear, in that exact order, in both Iteration 1 and Iteration 2 -- eight labeled steps total across two iterations -- satisfying ex-02's rule of labeling all four phases in order across at least two loop iterations.

Last updated July 17, 2026

Artifact: Perceive/Plan/Act/Observe Loop Trace

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